Ring motor and mill comprising same

Abstract

Provided in the present disclosure is a ring motor, comprising: a housing, which is configured to be in a ring shape and has a radially inner wall, the housing defining an inner cavity therein; a stator assembly, mounted on the radially inner wall at the side opposite to the inner cavity; and a rotor assembly, mounted on a radially inner side of the stator assembly, wherein the rotor assembly has a mounting portion for fixedly mounting a driven member at a radially inner side of the rotor assembly. Further provided in the present disclosure is a mill, comprising: the described ring motor; and a cylinder, the cylinder being fixedly connected to the rotor assembly as a driven member. The present disclosure provides structural support having higher strength and better stability for the stator assembly, and even for the entire ring motor.

Description

Ring motor and mill including the ring motor Technical Field

[0001] This disclosure relates to a ring motor, and also to a mill including the ring motor. Background Technology

[0002] When a mill is in operation, it requires a motor to drive the mill cylinder to rotate. A traditional mill drive system consists of a drive motor, a reduction gear, a pinion shaft, and a large gear. During operation, the drive motor drives the reduction gear, which in turn drives the pinion shaft, which in turn drives the large gear, ultimately rotating the mill cylinder to achieve grinding. This drive system involves numerous transmission links, each of which consumes energy, mechanical energy, lubrication, and space. This results in very low energy utilization and transmission efficiency, significantly increasing energy, mechanical, and lubrication consumption.

[0003] As an improvement, there is a ring motor that can directly drive the mill cylinder to rotate. However, the current ring motor's housing, stator assembly, rotor assembly, and the installation structure between the mill cylinder driven by the rotor assembly are not ideal. Especially for large-volume, high-load equipment like mills, the existing ring motor's frame or ring plate used to install the stator assembly faces problems such as insufficient strength, poor stability, and insufficient cooling.

[0004] Therefore, an improved ring motor and a mill using the ring motor are desired in the art. Summary of the Invention

[0005] To address the above problems, according to a first aspect of this disclosure, a ring motor is proposed, comprising: a housing configured in a ring shape and having a radial inner wall, the housing defining an inner cavity therein; a stator assembly mounted on the radial inner wall on a side opposite to the inner cavity; and a rotor assembly mounted on the radial inner side of the stator assembly; wherein the rotor assembly has a mounting portion for fixing a driven member on the radial inner side of the rotor assembly.

[0006] Unlike existing technologies that use simple frames or ring-shaped plates to mount stator assemblies, this disclosure uses a ring-shaped outer shell with an inner cavity to mount the stator assembly, thus providing stronger and more stable structural support for the stator assembly and the entire ring motor. Furthermore, compared to existing structures where the stator assembly is encapsulated within a housing, because the stator assembly is mounted on the radial outer wall on the side opposite to the inner cavity of the housing, heat from the stator assembly can be directly transferred to the housing through the radial outer wall and then dissipated to the external environment, further improving the heat dissipation of the stator assembly. Therefore, the ring motor of this disclosure is particularly suitable for mechanical equipment such as mills with high working loads and harsh operating conditions.

[0007] According to a second aspect of this disclosure, a mill is provided, comprising: a ring motor as described above; and a cylinder fixedly connected to a rotor assembly as the driven component. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments of this disclosure will be briefly described below. The drawings are merely illustrative of some embodiments of this disclosure and are not intended to limit all embodiments of this disclosure to them.

[0009] Figure 1 is a view of a ring motor according to an embodiment of the present disclosure.

[0010] Figure 2 is a view of one of the sub-shells in an embodiment in which the outer shell is configured as consisting of four sub-shells.

[0011] Figure 3 is a partial enlarged view of the sub-shell shown in Figure 2.

[0012] Figure 4 is a partial cross-sectional view of the sub-shell shown in Figure 2.

[0013] Figure 5 is a schematic diagram of the radial inner wall and the ribs thereon of a ring motor according to an embodiment of the present disclosure.

[0014] Figure 6 is a schematic diagram of a ring motor according to an embodiment of the present disclosure, in which a circumferential reinforcing plate has been added to the radial inner wall.

[0015] Figure 7A is a schematic diagram of a stator core mounting structure according to an embodiment of the present disclosure.

[0016] Figure 7B is a partially enlarged view of the stator core mounting structure of Figure 7A.

[0017] Figure 7C is a schematic diagram of a stator lamination according to an embodiment of the present disclosure.

[0018] Figure 7D is a schematic diagram of an integrally formed magnetic yoke and stator teeth of a stator lamination according to an embodiment of the present disclosure.

[0019] Figure 7E is a schematic diagram of a detachable toothed shoe of a stator lamination according to an embodiment of the present disclosure.

[0020] Figure 7F is a schematic diagram of a stator core mounting structure according to an embodiment of the present disclosure.

[0021] Figure 7G is a schematic diagram of a stator assembly according to an embodiment of the present disclosure.

[0022] Figures 8A and 8B show a first and second guard of a ring motor according to an embodiment of the present disclosure.

[0023] Figure 8C is a partial cross-sectional view of the housing, stator assembly, and rotor assembly of a ring motor according to an embodiment of the present disclosure.

[0024] Figures 9A-9F are schematic diagrams of rotor assemblies of a ring motor according to an embodiment of the present disclosure.

[0025] Figure 9G is a schematic diagram of a positioning device for a ring motor according to an embodiment of the present disclosure.

[0026] Figure 10 is a schematic front view of a ring motor system according to the present disclosure, including a ring motor and a mounting structure according to a first embodiment.

[0027] Figure 11 is a schematic side view of a ring motor system including a ring motor and a mounting structure according to a first embodiment, according to the present disclosure.

[0028] Figure 12 is a schematic perspective view of a ring motor system according to the present disclosure, including a ring motor and a mounting structure according to a first embodiment.

[0029] Figure 13 schematically shows a perspective view of the lateral support according to the present disclosure together with the housing of the annular motor fixed thereto.

[0030] Figure 14 schematically shows a perspective view of the lateral support according to the present disclosure together with the housing of the annular motor fixed thereto, at an angle different from that in Figure 4.

[0031] Figure 15 is a schematic perspective view of the assembled ring motor and its mounting structure according to the second embodiment of the present disclosure. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0033] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0034] The present disclosure will now be described in detail by way of example embodiments.

[0035] This disclosure proposes a ring motor and a mill including the ring motor.

[0036] Referring to Figures 1-3, Figure 1 is a view of a ring motor according to an embodiment of the present disclosure, Figure 2 is a view of one of the sub-shells in an embodiment in which the housing is configured as being composed of four sub-shells, and Figure 3 is a partial enlarged view of the sub-shell shown in Figure 2.

[0037] As shown in the figure, a ring motor according to an embodiment of the present disclosure includes: a housing 1, a stator assembly 2, and a rotor assembly 3. The housing 1 is constructed in an annular shape and has a radial inner wall 10, the housing 1 defining an inner cavity 14 therein. According to one embodiment, the housing 1 may include at least two sub-housings joined together circumferentially; in the embodiment shown in the figures, the housing 1 is formed by four sub-housings, each having substantially the same structure. The stator assembly 2 is mounted on the radial inner wall 10 on the side opposite to the inner cavity 14. The rotor assembly 3 is mounted radially inside the stator assembly 2. The rotor assembly 3 has a mounting portion 30 (described in detail below) for fixing a driven member to the radial inner side of the rotor assembly 3.

[0038] Unlike existing technologies that use simple frames or ring-shaped plates to mount stator assemblies, this disclosure uses a ring-shaped outer shell with an inner cavity to mount the stator assembly, thus providing stronger and more stable structural support for the stator assembly and the entire ring motor. Furthermore, compared to existing structures where the stator assembly is encapsulated within a housing, because the stator assembly is mounted on the radial outer wall on the side opposite to the inner cavity of the housing, heat from the stator assembly can be directly transferred to the housing through the radial outer wall and then dissipated to the external environment, further improving the heat dissipation of the stator assembly. Therefore, the ring motor of this disclosure is particularly suitable for mechanical equipment such as mills with high working loads and harsh operating conditions.

[0039] For example, referring to Figures 3-4, the stator assembly 2 also includes a stator core 21, which is secured to the radial inner wall 10 by a fixing device 23 passing through the radial inner wall 10. The stator core 21 can be integrally formed, for example, by a suitable magnetic material, or by stacking stator laminations as described later. It should be understood that the fixing device can be any suitable device or apparatus, as long as it can secure the stator assembly to the radial outer wall on the side opposite to the inner cavity.

[0040] Additionally, although in the embodiment shown in the figures the fixing device 23 also passes through the rib 45 and the sealing plate 40 related to the cooling channel 4 as described later, according to a simplified embodiment not shown that does not include the cooling channel, the fixing device 23 can directly pass through the radial inner wall 10 to fix the stator assembly 2.

[0041] For example, the stator assembly 2 may include a mounting member 22 (further see Figures 7A and 7B) mounted to the stator core 21, with the fixing device 23 fixed to the mounting member 22.

[0042] In the embodiment shown in Figures 3-4, the fixing device 23 can be a bolt, and the mounting member 22 can be a mounting strip fixedly disposed on the stator core 21. The bolt can be screwed through the radial inner wall 10 into the threaded hole on the mounting strip. However, it should be understood that, with knowledge of the principles of this disclosure, other forms of fixing devices and mounting members can be used. For example, the mounting member can be a mounting strip that passes axially through the stator core, and the fixing device can be any suitable device that fixes both ends of the mounting strip to the radial inner wall.

[0043] Referring again to Figures 3-4, the housing 1 may further include a cooling channel 4 extending circumferentially and radially opposite to the stator assembly 2, disposed within the inner cavity 14 on the radial inner wall 10. Any suitable coolant, such as water or oil, can flow in the cooling channel 4. Since the cooling channel 4 is adjacent to and directly opposite the stator assembly 2, heat from the stator assembly 2 is directly transferred via the radial inner wall 10 to the coolant within the cooling channel 4, thereby achieving optimized cooling of the stator assembly 2. Furthermore, the cooling channel 4 can be formed in any suitable manner; according to a simple embodiment, the cooling channel can be formed by welding C-shaped steel onto the radial inner wall 10.

[0044] According to one embodiment, further referring to Figures 5-6, the housing 1 may further include at least one rib 45 disposed in the cooling channel 4 for guiding the flow of coolant, the at least one rib 45 dividing the cooling channel 4 into multiple sub-channels. The coolant flow direction in adjacent sub-channels may be opposite, that is, the fluid in the sub-channels flows along a meandering path. The rib 45 may be fixed in the cooling channel 4, for example, by welding.

[0045] According to one embodiment, the rib 45 may extend circumferentially and have two ends, and have openings 451 at opposite circumferential ends of adjacent ribs 45, such that adjacent sub-channels are fluidly connected and the flow directions in adjacent sub-channels are opposite. Alternatively, according to another embodiment not shown, the rib may extend axially and have two ends, and have openings at opposite axial ends of adjacent ribs, such that adjacent sub-channels are fluidly connected and the flow directions in adjacent sub-channels are opposite.

[0046] By setting ribs 45 inside the cooling channel 4, not only can sufficient structural support be provided for the cooling channel 4, but also, since the coolant flows in opposite directions in adjacent sub-channels, the coolant can flow along the meandering path through the radial inner wall 10, which greatly improves the cooling efficiency and increases the cooling effect.

[0047] Furthermore, the fixing device 23 can pass through the corresponding rib 45 and through the radial inner wall 10 to be fixedly connected to the mounting member 22. As shown in Figure 6, the fixing device 23 (e.g., a bolt) can pass through the hole 450 on the rib 45 in a radially inward direction. This arrangement makes full use of the ribs in the cooling channel to install the stator assembly, avoiding the introduction of other additional mounting devices that may interfere with the cooling channel, making the overall structure more integrated, while also increasing the connection strength and stability of the stator assembly.

[0048] According to one embodiment of this disclosure, as shown in Figures 7A-7B, the stator core 21 may include a groove 210 opening toward the radially inner wall 10, and a mounting member 22 is disposed in the corresponding groove 210. The groove 210 is formed as a slot that is narrow on one side of the opening and wide on the other side of the bottom, and the shape of the mounting member 22 corresponds to the shape of the groove 210. This shape can effectively prevent the stator assembly 2 from disengaging from the radially inner wall 10 in a radially inward direction. The shape may be, for example, trapezoidal, "U"-shaped, etc. It should also be understood that the mounting member 22 may be interference-fitted with the groove 210 or fixedly connected by any other suitable means.

[0049] According to one embodiment, the stator core 21 may include a plurality of stator laminations stacked axially. Each stator lamination includes a notch such that after the plurality of stator laminations are stacked to form the stator core 21, the notches of each stator lamination are aligned and form the groove 210.

[0050] For example, stator laminations can also be joined circumferentially to form a larger stator core 21. One of the circumferentially adjacent stator laminations includes a recess facing the other circumferentially adjacent stator lamination, and the other circumferentially adjacent stator lamination includes a protrusion facing one of the circumferentially adjacent stator laminations and engaging with the recess, as shown by the dashed circle in Figure 7B. This provides positioning between the stator laminations during stator core assembly, facilitating assembly.

[0051] Figure 7C shows a schematic diagram of a stator lamination 150 according to an embodiment of the present disclosure. The stator lamination 150 includes a yoke 151, stator teeth 152, and toothed shoes 153. The yoke 151 and stator teeth 152 are integrally formed. The toothed shoes 153 are detachable relative to the integrally formed yoke 151 and stator teeth 152. Multiple stator laminations 150 are stacked to form a stator core 21. Before the stator windings are arranged on the stator core 21, the toothed shoes 153 (or stacked toothed shoes 153) are not assembled onto the integrally formed (stacked) yoke 151 and stator teeth 152, so the gaps between the stator teeth 152 are large, allowing the stator windings to be conveniently arranged radially between the stator teeth 152. After the stator windings are arranged, the toothed shoes 153 are assembled onto the integrally formed (stacked) yoke 151 and stator teeth 152. On the one hand, the toothed shoe 153 can fix the winding in the stator slot between the stator teeth 152; on the other hand, the toothed shoe 153 can reduce the stator slot gap, thereby reducing magnetic leakage.

[0052] The stator tooth 152 has a connecting groove 161 at the end away from the yoke 151, which is shown in detail in FIG. 7D. The tooth shoe 153 has a connecting protrusion 162 at the first end facing the stator tooth 152, which is shown in detail in FIG. 7E. The profile shape of the connecting groove 161 and the profile shape of the connecting protrusion 162 are the same or complementary to each other. The stator tooth 152 can be fitted with its connecting protrusion 162, especially inserted into the connecting groove 161 of the stator tooth 152 in the axial direction, and the connecting protrusion 162 and the connecting groove 161 can fit together tightly without gaps.

[0053] Figure 7E shows a schematic diagram of a detachable toothed shoe 153 of a stator lamination 150 according to an embodiment of the present disclosure. As shown in Figure 7E, the toothed shoe 153 has a connecting protrusion 162 and a shoe portion 163, the width of which is greater than that of the connecting protrusion 162 and greater than that of the stator tooth 152.

[0054] The connecting protrusion 162 has a first positioning portion 171, a second positioning portion 172, and a straight transition portion 173 in the radially inward direction of the stator core 21. The first positioning portion 171 protrudes in the circumferential direction of the stator core 21, the second positioning portion 172 is recessed in the circumferential direction, the circumferential width of the straight transition portion 173 gradually widens in the radially inward direction, and the straight transition portion 173 is connected to the shoe portion 163.

[0055] The dual positioning structure of the first positioning part 171 and the second positioning part 172 increases the contact area between the connecting groove 161 and the connecting protrusion 162, thereby increasing the connection strength between the stator tooth 152 and the toothed shoe 153. The straight transition part 173 is widest at the end closest to the shoe part 163, which improves the connection strength between the connecting protrusion 162 and the shoe part 163 and avoids the risk of the connecting protrusion 162 and the shoe part 163 breaking under force.

[0056] In embodiments according to this disclosure, the contours of the first positioning portion 171 and the second positioning portion 172 may be, for example, smooth, and in particular, arc-shaped. According to one embodiment, the contours of the first positioning portion and the second positioning portion may, for example, have an "S"-shaped transition.

[0057] In embodiments according to this disclosure, the outlines of the first positioning portion 171, the second positioning portion 172, and the straight transition portion 173 may be symmetrical about left and right in the radial direction, as shown in Figures 7C and 7E.

[0058] In embodiments according to this disclosure, the width of the straight transition portion 163 in the circumferential direction, i.e., the circumferential width, may be greater than the circumferential width of the second positioning portion 172.

[0059] In embodiments according to this disclosure, a plurality of rivet points may be provided on the toothed shoe 153. A plurality of stator laminations 150 can be stacked and fixed together by the first rivet point 181, the second rivet point 182, and the third rivet point 183. According to one embodiment, the first rivet point 181 may be located on the centerline of the connecting protrusion 82. According to another embodiment, the first rivet point 181 may be located at the center of the second positioning portion 172. In embodiments according to this disclosure, the second rivet point 182 and the third rivet point 183 are symmetrically arranged in the circumferential direction of the shoe portion 163.

[0060] By placing the first riveting point 181 at the narrower second positioning portion 172, the impact of the recess in the second positioning portion 172 on the structural strength is reduced, thus ensuring the structural strength of the second positioning portion 172. The second riveting point 182 and the third riveting point 183 are located at both ends of the narrower boot portion 163, which also ensures the structural strength of the boot portion 163. The first riveting point 181, the second riveting point 182, and the third riveting point 183 together reduce the structural strength of the toothed boot 153.

[0061] This disclosure also relates to a stator core 21, which is formed by stacking stator laminations 150 according to embodiments of this disclosure, as shown in Figures 2, 7A, and 7B.

[0062] According to another embodiment, referring to FIG7F, the stator assembly 22 further includes a stator core 221 and a stator conductor 222, wherein the stator core 221 is fixed to the radial inner wall 10 by a fixing device passing through the radial inner wall 10. It should be understood that the fixing device can be any suitable device or apparatus, as long as it can fix the stator assembly to the radial outer wall on the side opposite to the inner cavity. The stator core 221 can be integrally formed, for example, from a suitable magnetic material. The stator core 221 includes a yoke 231, stator teeth 232, and toothed shoes 233. The yoke 231 and stator teeth 232 are integral, and the toothed shoes 233 are detachable relative to the yoke 231 and stator teeth 232.

[0063] Figure 7G is a schematic diagram of the stator assembly 22 according to an embodiment of the present disclosure. Figure 7G shows the structure of the stator assembly 22 and the positional relationships between the various components in more detail. The yoke 231 and the stator teeth 232 are integral, while the tooth shoe 233 is detachable relative to the yoke 231 and the stator teeth 232. Before the stator conductors 222 are arranged on the stator core 221, the tooth shoe 233 is not assembled onto the stator teeth 232, so the gap between the stator slots of the stator teeth 232 is large, which facilitates the radial arrangement of the stator conductors 222 into the stator slots 234. After the stator conductors 222 are arranged, the connecting protrusion of the tooth shoe 233 is inserted into the connecting slot of the stator teeth 232 along the lateral direction of the stator core 221, i.e., along the axial direction of the stator or motor. On the one hand, the stator teeth 232 can fix the stator conductor 222 in the stator slot 234; on the other hand, the stator teeth 232 can reduce the slot gap, thereby reducing magnetic leakage.

[0064] In this disclosure, the axial end 251 of the stator conductor 222 protrudes from the stator slot 234, and the end 251 is bent outward in the radial direction, as shown in FIG7G. In an embodiment according to this disclosure, the toothed shoe 233 is inserted into the stator tooth 232 in the axial direction, and the degree to which the end 251 of the stator conductor 222 is bent outward in the radial direction is designed such that the end 251 of the stator conductor 222 does not interfere with the toothed shoe.

[0065] The bending of the end 251 of the stator conductor 222 can provide space for the insertion of the toothed shoe 233 in the axial direction, which can prevent the toothed shoe 233 from interfering with the stator conductor 222 during the insertion process, thereby causing wear of the stator conductor 222.

[0066] In embodiments according to this disclosure, the stator conductor 222 can be configured as an annular conductor surrounding a stator tooth 232. In this case, as shown in FIG7F, one conductor segment of the two stator conductors 222 is arranged together in a stator slot 234. This shape of stator conductor 222 is particularly suitable for forming the stator winding of a brushless DC motor.

[0067] In an embodiment according to this disclosure, the side of the stator conductor 222 facing the opening of the stator slot 234 is flush with the end of the adjacent stator tooth 232. On the one hand, the stator conductor 222 can occupy as much of the stator slot 234 as possible to increase the slot fill factor, and on the other hand, it can avoid interference between the tooth shoe 233 and the stator conductor when inserted.

[0068] In embodiments according to this disclosure, the stator conductor 222 may in particular be a flat wire conductor. In other embodiments, the stator conductor 222 may also be a multi-turn wire surrounding the stator teeth 232.

[0069] This disclosure also proposes an electric motor stator composed of a plurality of stator assemblies 22 according to this disclosure. The plurality of stator assemblies 22 are assembled into a ring and thus form the electric motor stator. Figure 7F exemplarily illustrates three stator assemblies 22 and their assembly. In embodiments according to the utility model, an electric motor stator may, for example, consist of 4, 8, 12, 16, 20, or more stator assemblies 22.

[0070] In embodiments according to this disclosure, the motor stator may be configured, for example, as the stator of a brushless DC motor, and the stator conductor 222 may be configured as a stator conductor 222 suitable for a brushless DC motor. Therefore, the stator conductor 222 may in particular be configured as an annular conductor surrounding a stator tooth 232.

[0071] According to one embodiment, referring to Figures 3-4 and 6, the outer casing 1 may include a radially outer wall 13 and a first sidewall 11 and a second sidewall 12 connected to the radially outer wall 13 and the radially inner wall 10, and the radially outer wall 13, the radially inner wall 10, the first sidewall 11, and the second sidewall 12 define the inner cavity 14. Furthermore, a reinforcing plate may be provided in the inner cavity 14 to provide support for the outer casing 1. The reinforcing plate can have any suitable structure and form, as long as it provides structural support to the outer casing in a suitable orientation, and, as needed, the reinforcing plate can be fixedly connected to the various walls of the outer casing (e.g., welded connection).

[0072] According to one embodiment, particularly referring to Figures 4 and 6, the reinforcing plate may include at least one circumferential reinforcing plate located between the radial outer wall 13 and the radial inner wall 10. The at least one circumferential reinforcing plate includes a first circumferential reinforcing plate 51 and a second circumferential reinforcing plate 52 extending circumferentially, which together provide strong radial support for the housing 1. The housing 1 may also include a sealing plate 40 disposed between the first circumferential reinforcing plate 51 and the second circumferential reinforcing plate 52 and spaced apart from the radial inner wall 10. The sealing plate 40 has an arcuate shape extending circumferentially, thereby forming the cooling channel 4 by the first circumferential reinforcing plate 51, the second circumferential reinforcing plate 52, the radial inner wall 10, and the sealing plate 40. Thus, by utilizing a portion of the first circumferential reinforcing plate 51 and the second circumferential reinforcing plate 52 for providing support for the housing 1 to form the cooling channel 4, the configuration of the cooling channel 4 is simplified, and installation is easier.

[0073] According to one embodiment, referring to Figures 4 and 8C, the sealing plate 40 includes multiple sub-sealing plates with gaps between adjacent sub-sealing plates, and the rib 45 has a boss 47 protruding into the gap between adjacent sub-sealing plates. Welding on both sides of the boss 47 of the rib 45 can securely connect the rib 45 to the adjacent sub-sealing plates, allowing the fixing device 23 to pass through the top surface of the boss 47 through the rib 45. According to another embodiment (not shown), the sealing plate can be a single sealing plate, i.e., a single annular plate with multiple gaps, and the rib can have similar bosses 47 and be installed in a similar manner to those described above. This structure facilitates the connection between the sealing plate and the rib, resulting in a welded connection with higher sealing performance and strength.

[0074] According to an embodiment not shown, the reinforcing plate may include at least one axially extending reinforcing plate, such as an axially extending reinforcing plate supported between the first sidewall 11 and the second sidewall 112. The at least one axially extending reinforcing plate is preferably welded to the four walls of the outer shell within the inner cavity.

[0075] For example, according to the embodiment shown in FIG4, the at least one axial reinforcing plate may include: at least one first axial reinforcing plate 61 disposed between the first sidewall 11 and the first circumferential reinforcing plate 51 and extending axially; at least one second axial reinforcing plate 62 disposed between the second sidewall 12 and the second circumferential reinforcing plate 52 and extending axially; and at least one intermediate reinforcing plate 63 disposed between the first circumferential reinforcing plate 51 and the second circumferential reinforcing plate 52, extending axially and located radially outside the end plate 40. The intermediate reinforcing plate 63 may, for example, be welded to the end plate 40. By providing these axially extending reinforcing plates, axial and radial support can be provided for the housing 1 in the space between the circumferentially extending first sidewall 11, the first circumferential reinforcing plate 51, the second circumferential reinforcing plate 52, and the second sidewall 12.

[0076] Additionally, the edge of the at least one axial stiffening plate (stiffening plates 61, 62, 63 as described above) facing the radial inner wall 10 may have a notch 16. Since stator assemblies typically require impregnation, adding notches to the axial stiffening plates allows paint to flow away, thereby reducing paint residue inside the housing after impregnation. This not only reduces paint usage but also lowers production costs and avoids undesirable weight increases. It should be understood that the notches 16 can be provided in any suitable number, for example, at least one. The shape of the notches 16 can also be any suitable shape, such as semicircular, triangular, trapezoidal, or rectangular.

[0077] According to one embodiment, as shown in Figures 8A and 8B viewed from opposite axial directions of the ring motor, the ring motor may further include a first shield 71 disposed outside the first sidewall 11 and a second shield 72 disposed outside the second sidewall 12 to cover the stator assembly 2 and rotor assembly 3 of the ring motor. It should be understood that when the housing is composed of multiple sub-housing segments, the first shield 71 and the second shield 72 may also be segmented for each sub-housing; or a single ring shield may be provided for all sub-housings.

[0078] Furthermore, the outer shell 1, stator assembly 2, rotor assembly 3, first protective cover 71 and second protective cover 72 form a gap space, as shown in Figure 8C.

[0079] Referring further to Figures 8A, 8C, and 5-6, a fan 9 can be installed on the radial outer wall 13 to blow cooling air into the inner cavity 14. The radial inner wall 10 also includes exhaust holes 101 (preferably on both axial sides of the radial inner wall 10) to connect the inner cavity 14 with the gap space. By providing exhaust holes 101, air blown into the inner cavity 14 from the external environment by the fan 9 is discharged through the exhaust holes 101, thus maintaining a positive pressure in the inner cavity 14 at all times. This not only facilitates the discharge of heat from the inner cavity 14 but also more effectively prevents contaminants from entering the inner cavity 14.

[0080] According to one embodiment, in order to increase airflow in the inner cavity 14, the reinforcing plates (such as the aforementioned axial and circumferential reinforcing plates) may have connecting holes to connect the chambers separated by the reinforcing plates in the inner cavity 14. Furthermore, these connecting holes also serve to reduce weight and are therefore also referred to as weight-reducing holes.

[0081] According to one embodiment, the first circumferential reinforcing plate 51, the second circumferential reinforcing plate 52, the at least one first axial reinforcing plate 61 and the at least one second axial reinforcing plate 62 and / or the at least one intermediate reinforcing plate 63 have weight-reducing holes, thereby further reducing the overall weight of the housing 1 and consequently reducing the weight of the ring motor.

[0082] According to one embodiment, the radial outer wall 13 has an access port 130 for intervening in the inner cavity 14 to access the at least one rib 45, see Figures 1 and 3. This access port 130 facilitates the installation of components within the housing, particularly stator assembly installation, bolt tightening, welding, etc. The access port 130 can also be closed by a cap.

[0083] According to one embodiment, the ring motor includes a plurality of intermediate reinforcing plates 63, which are axially connected between a first circumferential reinforcing plate 51 and a second circumferential reinforcing plate 52 and located radially outside the sealing plate 40. Corresponding access ports 130 can be provided between adjacent intermediate reinforcing plates 63 along the circumferential direction.

[0084] The rotor assembly 3 typically includes a rotor core 36 and magnets 361 mounted on the rotor core 36. According to one embodiment, referring to Figures 8C and 9A-9C, the rotor assembly 3 of the toroidal motor may include a mounting portion 30 and a plurality of mounting ribs 35. The mounting portion 30 may be annular, with a plurality of axially extending and circumferentially spaced mounting portion slots 34 provided on its radially outer surface. Each of the plurality of mounting ribs 35 has a first rib portion accommodated in the mounting portion slot 34 and a second rib portion accommodated in a core slot 37 on the radially inner surface of the rotor core 36. Furthermore, both the mounting portion slot 34 and the core slot 37 have limiting portions that restrict the radial movement of the mounting ribs 35, thereby restricting the movement of the rotor core 36 in the radial direction and making the operation of the toroidal motor more stable. For this purpose, the mounting ribs 35 may be ribs with an I-shaped cross-section.

[0085] Furthermore, due to the large size of the rotor assembly of the toroidal motor, the magnetic attraction between it and the stator is extremely strong during installation, making installation very difficult and prone to safety hazards. Therefore, the rotor core 36 can slide to its mounting position on the rotor mounting part 30 by means of the sliding of the mounting ribs 35, so as to achieve convenient and effective sliding assembly. The following focuses on the structural features and assembly methods related to sliding assembly.

[0086] Specifically, referring further to Figures 9D-9F, this disclosure utilizes multiple mounting ribs 35 as one of the mounting components for mounting the rotor core 36 to the rotor mounting portion 30, such that the mounting ribs 35 are fixedly connected to the rotor core 36. Simultaneously, the related structure is configured such that during the assembly of the rotor assembly, the multiple rotor cores 36 can move to their mounting positions on the rotor mounting portion 30 by means of the sliding of the mounting ribs 35 in the mounting portion groove 34. A specific implementation of the fixed connection between the mounting ribs 35 and the rotor core 36 can be that a second rib portion is accommodated in the core groove 37 and fixed relative to the core groove 37. However, in embodiments not shown, the mounting ribs 35 and the rotor core 36 may have other fixing methods.

[0087] According to one embodiment, the first groove end 341 of the mounting portion strip groove 34 is open in the axial direction, as shown in FIG9E, to allow the mounting rib 35 to be inserted into the mounting portion strip groove 34 in the axial direction. Thus, the mounting rib 35 can be pre-fixed to the rotor mounting portion 30 by inserting it into the mounting portion strip groove 34 from the first groove end 341.

[0088] As shown in Figure 9F, the second groove end 342 of the mounting slot 34 is not open in the axial direction. The second groove end 342, which is closed in the axial direction, can be used to provide a stop for the mounting rib 35. It should be understood that, in embodiments not shown, the second groove end 342 of the mounting slot 34 can also be configured to be open in the axial direction. In addition, fixing plates 39 can be provided at the two axial ends of the rotor core 36 to hold the magnet 361, as shown in Figure 9F.

[0089] According to one embodiment of this disclosure, the mounting portion 30 comprises a first mounting portion 31, a second mounting portion 32, and an intermediate mounting portion 33 connecting the first mounting portion 31 and the second mounting portion 32. The intermediate mounting portion 33 extends perpendicularly to the first mounting portion 31 and the second mounting portion 32, such that the cross-section of the mounting portion 30 is T-shaped. According to one embodiment, the first mounting portion 31, the second mounting portion 32, and the intermediate mounting portion 33 can be manufactured separately and fixed together by known methods. However, in some embodiments, any two of the first mounting portion 31, the second mounting portion 32, and the intermediate mounting portion 33 can be manufactured integrally. According to one embodiment, the intermediate mounting portion 33 is provided with a plurality of axially spaced through holes. Fasteners such as bolts can pass through the axial through holes to securely connect a driven component (e.g., a mill cylinder described later) to the intermediate mounting portion 33 of the mounting portion 30.

[0090] Therefore, the mounting section 30 is used not only to mount the rotor core but also to mount the driven components. It should be understood that the mounting section 30 may also have other structures and forms depending on the specific structure and requirements of the driven components.

[0091] Furthermore, the first mounting portion 31 and the second mounting portion 32 of the mounting portion 30 can have different thicknesses. For example, the driven member can be fixedly connected to the intermediate mounting portion 33 on one side of the first mounting portion 31 of the mounting portion 30. Therefore, by setting the thickness of the first mounting portion 31 to be greater than that of the second mounting portion 32, greater structural strength and improved connection reliability can be provided on the side where the driven member is mounted. At the same time, since the thickness of the second mounting portion 32 is smaller, the overall mass of the rotor assembly 3 can be reduced, thereby reducing the weight of the entire ring motor.

[0092] According to one embodiment, the radial inner periphery of the first shield 71 and the second shield 72 includes a first labyrinth seal structure, which is non-airtightly fitted with a second labyrinth seal structure on the mounting portion 30 of the rotor assembly 3 to prevent contaminants from entering but allow air from the gap space to escape.

[0093] It should be understood that the labyrinth sealing structure can take many forms. For example, in the embodiment of FIG8C, the labyrinth structure can be: at least one annular protrusion extending axially inward on the radial inner edge of the first shield 71 and the second shield 72, while at least one annular groove for accommodating at least one annular protrusion is correspondingly formed on the first mounting portion 31 and the second mounting portion 32, as shown by the dashed circle in FIG8C, thereby preventing external contaminants from entering and allowing air from the gap space to escape.

[0094] It should be understood that although coolant cooling (e.g., water cooling) and air cooling have been described above, they can be implemented separately depending on the application and requirements of the toroidal motor. For large equipment such as mills operating in harsh environments, both water cooling and air cooling can be used simultaneously, which can provide better heat dissipation for the stator assembly and prevent external contaminants from entering the toroidal motor.

[0095] As mentioned earlier, the stator and rotor assemblies of a ring motor are usually large in size and weight, which leads to problems such as inconvenient installation and low assembly accuracy during the assembly process. Therefore, the centering often needs to be adjusted repeatedly during the assembly process.

[0096] Therefore, this disclosure also proposes a technical solution to improve the installation of rotor assemblies. Specifically, referring to Figures 2 and 9C, according to an embodiment of this disclosure, the ring motor may further include a plurality of positioning devices 15, each positioning device 15 including: a positioning base 151; and a positioning wheel 152 supported on the positioning base 151. The positioning base 151 is mounted on the housing 1, thereby enabling the positioning device 15 to change at least between a working posture and a disassembly posture and / or a lifting posture. In the working posture, the positioning wheel 152 is positioned in the guide groove 38 on the rotor assembly 3; in the disassembly posture, the positioning device 15 is removed from the housing 1; and in the lifting posture, the positioning wheel 152 is lifted from the guide groove 38.

[0097] By introducing this positioning device, during the assembly of the stator and rotor assemblies, the positioning device, in its working posture, connects to the stator assembly on one hand and acts on the rotor assembly on the other, thereby ensuring accurate axial positioning between the stator and rotor assemblies. After the assembly process is completed, the positioning device can be removed as needed, i.e., placed in a disassembled posture; or it can be changed to a raised posture without affecting the normal operation of the rotor assembly due to friction with the guide groove.

[0098] It should be understood that the positioning device 15 can be mounted to any suitable location on the housing 1 via its positioning base 151, for example, multiple positioning devices 15 can be mounted on the first sidewall 11 and the second sidewall 12 respectively. The positioning device 15 is described below using the positioning device 15 mounted on the second sidewall 12 as shown in FIG. 9G as an example. In addition, the guide groove 38 can be provided at any suitable location on the rotor assembly 3, for example, it can be provided at the outer edge of the first mounting portion 31 and the second mounting portion 32.

[0099] According to one embodiment, the positioning base 151 includes a positioning fixing part 153 mounted on the housing 1, a positioning bracket 154 for supporting the positioning wheel 152, and an elastic arm 155 connected between the positioning fixing part 153 and the positioning bracket 154. The elastic arm 155 can be bent, with one end connected to the positioning fixing part 153 and the other end connected to the positioning bracket 154, so that the elastic arm 155 can elastically deform along the radial direction of the ring motor when the positioning wheel 152 is subjected to an external force.

[0100] Therefore, during assembly, the rotor assembly 3 can rotate circumferentially relative to the stator assembly 2, but maintains a relatively fixed relative position in the axial direction of the ring motor. Thus, if uneven gaps occur between the stator assembly 2 and / or the rotor assembly 3 due to roundness defects, an external force will act on the positioning wheel 152. The positioning wheel 152 will transmit this force to the elastic arm 155, causing the elastic arm 155 to undergo elastic deformation in the radial direction of the ring motor, thereby compensating for the roundness error and ensuring that the assembly operation continues. Of course, the elastic arm 155 can also have other shapes, such as an S-shape.

[0101] In addition, multiple positioning devices 15 can be arranged on the stator assembly 2 at uniform angular distances along the circumference of the ring motor.

[0102] In summary, this disclosure provides a more optimized ring motor with a housing with an inner cavity, providing a stronger and more stable mounting structure for the stator assembly. Furthermore, the inner cavity of the housing is fully utilized to set up a more effective stator cooling structure and a pollution prevention structure, making it more suitable for large equipment operating in harsh environments.

[0103] The mounting structure of the ring motor for a mill according to this disclosure will be described in detail below.

[0104] Referring to Figure 12, Figure 12 schematically illustrates the mounting structure 41 according to a first embodiment. The mounting structure 41 includes a first lateral support 421 and a second lateral support 422. According to one embodiment, the first lateral support 421 and the second lateral support 422 are located on opposite sides of the annular portion of the housing 1 of the ring motor 10 about axis X, and are fixed to the outer periphery of the housing 1. For example, the first lateral support 421 and the second lateral support 422 are fixed to the outer periphery of the housing 1 by welding. In the example shown in Figure 10, the first lateral support 421 and the second lateral support 422 are respectively fixed to two lower sub-housings located on the housing 1. The mounting positions of the first lateral support 421 and the second lateral support 422 can be symmetrical with respect to a vertical plane passing through the rotation axis of the ring motor, thereby providing balanced and stable support for the annular housing 1 and the motor components mounted thereon. It should be understood that the number of lateral supports is not limited to two, and more lateral supports can be provided depending on the weight and structure of the ring motor.

[0105] The mounting structure 41 also includes a fixed base assembly 300, as shown in Figures 10 to 12 and Figure 15. The fixed base assembly 300 can be positioned on the ground of the work site. The fixed base assembly 300 may include a first support fastener 310, a second support fastener 320, and a lateral connector 370. The first support fastener 310 can be fixedly connected to a first lateral support 421, for example, by bolts, to support and secure the first lateral support 421. The second support fastener 320 can be fixedly connected to a second lateral support 422, for example, by bolts, to support and secure the second lateral support 422. The lateral connector 370 fixedly connects the first support fastener 310 and the second support fastener 320 in the lateral direction, thereby forming an integral, stable base assembly.

[0106] More specifically, the first support fixing member 310 and the second support fixing member 320 can be located below the first lateral support 421 and the second lateral support 422, respectively, to support them. The lateral connecting member 370 can have an elongated shape, with its two ends fixedly connected to the first support fixing member 310 and the second support fixing member 320, respectively. The lateral connecting member 370 may include multiple connecting members to form a frame structure capable of withstanding large vibrations together with the first support fixing member 310 and the second support fixing member 320, thereby achieving stable support for the ring motor.

[0107] Compared with the existing installation structure that uses a single bracket to directly fix the ring motor to the ground, the technical solution adopted in this disclosure, which uses at least two lateral supports to directly support the ring motor and a fixed base assembly with corresponding fixed support components and transverse connecting components, ensures better structural support for the stability and balance of the entire ring motor.

[0108] Furthermore, as mentioned above, the large weight, volume, and numerous components of the ring motor contribute to the complexity of its installation. The installation structure according to this disclosure provides greater installation flexibility and convenience. Specifically, the installation structure 41 comprises two separable parts: a first lateral support 421 and a second lateral support 422 that directly support the ring motor 10, and a fixed base assembly for supporting and securing the lateral supports 421 and 22. In this case, for example, the housing 1 can be pre-welded together with the first lateral support 421 and the second lateral support 422 to form a first pre-assembly, and the first support fixing member 310, the second fixed support member 320, and the lateral connector 370 can be pre-installed together to form a second pre-assembly, which is then assembled together at the work site. The first and second pre-assemblies can also be formed in different work locations. Thus, while ensuring stable support for the ring motor, the installation of large components becomes more flexible and convenient.

[0109] The lateral supports of the mounting structure will be described in detail below. The first lateral support 421 and the second lateral support 422 may have the same structure, so only one of the lateral supports will be described below.

[0110] Referring to Figures 13 and 14, the first lateral support 421 and the second lateral support 422 each include a first connecting plate 230 extending in a horizontal direction. Here, the horizontal direction refers to a direction parallel to the ground; in the example shown in Figure 12, it could be a direction parallel to axis X. The first lateral support 421 and the second lateral support 422 also each include a base plate 240 for mounting to a corresponding first support fastener 310 or second support fastener 320. For example, the base plate 240 has a flat plate shape with multiple mounting through holes for bolts to pass through and secure to the corresponding first support fastener 310 or second fastener 320. The base plate 240 can also be a plate extending in a horizontal direction, and the corresponding support fastener has a flat contact surface that mates with the base plate 240 to form a stable mounting interface. Furthermore, the first lateral support 421 and the second lateral support 422 also include a plurality of vertical connecting plates 270 and 280, as shown in Figures 13 and 14. The vertical connecting plates 270 and 280 are arranged in the horizontal direction and fixed to the first connecting plate 230 and the base plate 240.

[0111] The first connecting plate 230 is fixed to the housing 1. For example, the first connecting plate 230 may have a rectangular shape, and its edge adjacent to the housing 1 is welded to the housing so as to fix it thereto.

[0112] The vertical connecting plates 270 and 280 can be parallel plates in the vertical direction, and they are arranged at intervals in the horizontal direction. The vertical connecting plates 270 and 280 can have irregular shapes, as shown in Figures 13 and 14. Their upper ends can be fixed to the first connecting plate 230, for example, by welding, their edges adjacent to the outer shell 1 can be fixed to the outer shell 1 by welding, and their lower ends can be fixed to the base plate 240 by welding.

[0113] Thus, the first connecting plate 230, the base plate 240, and the vertical connecting plates 270 and 280 form a stable frame support structure, which can more effectively support the ring motor.

[0114] To further strengthen the installation structure, the first lateral support 421 and the second lateral support 422 also include a second connecting plate 250 located between the first connecting plate 230 and the base plate 240, as shown in Figures 13 and 14. This second connecting plate 250 is inclined relative to the base plate 240 and fixed to both the base plate 240 and the vertical connecting plates 270 and 280. In the example shown, the second connecting plate 240 is located below the first connecting plate 230 and may have a generally rectangular plate shape. The upper end of the second connecting plate 240 can be welded to the outer casing 1, and it extends downward and outward away from the outer casing 1, with its lower end welded to the base plate 240. Thus, the base plate 240 is also indirectly fixed to the outer casing 1, and because the second connecting plate 230 is inclined relative to the base plate 240, the aforementioned frame support structure is also strengthened on the sides of the frame.

[0115] According to one embodiment, a transverse reinforcing plate 260 is further provided between the first connecting plate 230 and the second connecting plate 250, and the transverse reinforcing plate 260 is fixed to at least two of the vertical connecting plates 270 and 280. More transverse reinforcing plates 260 can be provided to increase the strength of the lateral support. The transverse reinforcing plate 260 can be a flat plate extending in the horizontal direction, and in the case of multiple transverse reinforcing plates 260, they can be parallel to each other.

[0116] Further, as shown in Figures 13 and 14, the first connecting plate 230, the second connecting plate 250, and the innermost adjacent vertical connecting plate 280 enclose each other to form an operating space, and the outer casing 1 is provided with an operating window 111 corresponding to the operating space, and the outer casing 1 includes a cover 112 for covering the operating window. In the case of a transverse reinforcing plate 260, the first connecting plate 230, the transverse reinforcing plate 260, and the innermost adjacent vertical connecting plate 280 enclose each other to form a first operating space 291, while the transverse reinforcing plate 260, the second connecting plate 250, and the innermost adjacent vertical connecting plate 280 enclose each other to form a second operating space 292.

[0117] Thus, the first lateral support 421 and the second lateral support 422 not only provide a stable support structure but also reserve an operating space. Within this operating space, the cover 112 of the outer casing 1 is exposed. When operations such as fixing or disassembling the stator laminations are required, the cover 112 of the outer casing 1 is opened, allowing tools to reach into the casing through the enclosed operating space to access the internal components of the ring motor for related operations, such as tightening or loosening the fixing bolts of the stator laminations. This significantly reduces the difficulty of assembling and disassembling the stator laminations located at the lateral supports.

[0118] The mounting base assembly 300 according to the installation structure of this disclosure will now be described in detail.

[0119] Figures 10 to 12 illustrate a first embodiment of the fixed base assembly. As shown in Figures 10 to 12, the first support fixing member 310 and the second support fixing member 320 are metal bases, and have a first side and a second side located opposite to each other in the horizontal direction, respectively. In the example shown in Figure 12, the side that can be seen is the first side, while the side opposite to the first side in the direction of the axis X is the second side (not visible in the figure). The transverse connector 370 includes at least two connectors (as shown in Figure 11), each having a first mounting portion 371 fixedly connected to the first support fixing member 310 and a second mounting portion 372 fixedly connected to the second support fixing member 320, and fixed to the first support fixing member 310 and the second support fixing member 320 respectively on the first side and the second side.

[0120] Specifically, the main body of the connector can be a hollow rod, such as a long hollow metal rod with a rectangular cross-section. Such a connector is an readily available component, significantly reducing the cost of the fixed support. The first mounting portion 371 and the second mounting portion 372 can be flat metal sheets that can be welded to both ends of the connector and have mounting through holes. Bolts can pass through these mounting through holes to secure the transverse connector to the first support fixture and the second fixed support.

[0121] In this embodiment, the fixed base assembly 300 can be formed by assembling discrete components. Each component can be transported in a disassembled state and assembled on-site at the work site. It can also be disassembled and reinstalled as needed. Therefore, it provides more advantages in terms of the ease of installation of the ring motor and the replacement of easily worn parts.

[0122] Furthermore, as shown in Figure 12, the first support fixing member 310 of the metal base has a columnar body, and the second support fixing member (320) of the metal base has a columnar body 325, and also has support plates 316 and 326 located below the columnar bodies respectively. The columnar bodies 315 and 325 may have an overall rectangular cuboid shape, and the support plates 316 and 326 may be metal plates with a certain thickness, the area of ​​which is larger than the area occupied by the bottom of the columnar bodies 315 and 325. That is to say, the support plates 316 and 326 extend beyond the perimeter of the columnar bodies 315 and 325, thereby increasing the contact area between the support fixing member and the ground, and further enhancing the support stability. In addition, the metal base also has reinforcing ribs 317 and 327 extending from the columnar bodies 315 and 325 and fixed to the support plates 316 and 326.

[0123] Figure 15 illustrates a second embodiment of the fixed base assembly. In this embodiment, the first lateral support 421 and the second lateral support 422 have the same structure as described with respect to Figures 10 to 14, and will not be repeated here.

[0124] In this embodiment, as shown in FIG15, the first support fixing member 310 and the second support fixing member 320 are columns, while the transverse connecting member 370 is a column integrally manufactured with the first support fixing member 310 and the second support fixing member 320. In this case, the fixing base assembly can be integrally molded from concrete and manufactured on-site at the workplace.

[0125] In summary, this disclosure provides a more optimized mounting structure for a ring motor, which has a first lateral support and a second lateral support, as well as a fixed base assembly composed of a first support fixing member, a second support fixing member and a lateral connecting member. While providing stable support for the ring motor, it also leaves operating space for the internal components of the ring motor, thereby improving installation convenience and flexibility.

[0126] This disclosure also provides a mill, as shown in FIG15, wherein the cylinder 8 is fixedly mounted on the radially inner side of the rotor assembly 3, for example, by bolts mounting the cylinder 8 on the intermediate mounting portion 33 of the mounting portion 30. Although not shown, it should be understood that the mill cylinder 8 can be supported at its axial end by a structure consisting of necessary bearings, brackets, etc., so that the cylinder 8 and the rotor assembly 3 can rotate stably together.

[0127] The embodiments referred to above describe in detail the exemplary implementation of the ring motor proposed in this disclosure. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure.

Claims

1. A ring motor, comprising: The outer shell (1) is constructed in an annular shape and has a radial inner wall (10), the outer shell (1) defining an inner cavity (14) therein; The stator assembly (2) is mounted on the radial inner wall (10) on the side opposite to the inner cavity (14); The rotor assembly (3) is mounted on the radial inner side of the stator assembly (2); The rotor assembly (3) has a mounting portion (30) for fixing the driven component on the radially inner side of the rotor assembly (3).

2. The ring motor of claim 1, wherein, The stator assembly (2) includes a stator core (21) which is fixed to the radial inner wall (10) by a fixing device (23) passing through the radial inner wall (10); preferably, the stator assembly (2) includes a mounting member (22) mounted to the stator core (21), and the fixing device (23) is fixed to the mounting member (22).

3. The ring motor of claim 2, wherein, The housing (1) includes a cooling channel (4) extending circumferentially and radially opposite to the stator assembly (2) disposed on the radial inner wall (10) in the inner cavity (14). Preferably, the housing (1) also includes at least one rib (45) disposed in the cooling channel (4) for guiding the flow of coolant. Preferably, the radial outer wall (13) has an access port (130) for intervening in the inner cavity (14).

4. The ring motor of claim 2, wherein, The stator assembly (2) includes a mounting member (22) mounted to the stator core (21), and the fixing device (23) is fixed on the mounting member (22). Preferably, the stator core (21) includes a groove (210) opening toward the radial inner wall (10), and the mounting member (22) is disposed in the corresponding groove (210). The groove (210) is formed as a slot that is narrow on one side of the opening and wide on one side of the bottom, and the shape of the mounting member (22) corresponds to the shape of the groove (210).

5. The ring motor of any one of claims 1-4, wherein, The outer shell (1) includes a radial outer wall (13) and a first side wall (11) and a second side wall (12) connected to the radial outer wall (13) and the radial inner wall (10), and the radial outer wall (13), the radial inner wall (10), the first side wall (11) and the second side wall (12) define the inner cavity (14), and a reinforcing plate is provided in the inner cavity (14) to provide support for the outer shell (1).

6. The ring motor of claim 5, wherein, The reinforcing plate includes at least one axially extending reinforcing plate, and the edge of the at least one axially extending reinforcing plate facing the radial inner wall (10) has a notch (16).

7. The toroidal electric machine of claim 6, wherein, The reinforcing plate includes a first circumferential reinforcing plate (51) and a second circumferential reinforcing plate (52) located between the radial outer wall (13) and the radial inner wall (10) and extending circumferentially, and the outer shell (1) includes a sealing plate (40) disposed between the first circumferential reinforcing plate (51) and the second circumferential reinforcing plate (52) and spaced apart from the radial inner wall (10), the sealing plate (40) having an arcuate shape extending circumferentially, such that the first circumferential reinforcing plate (51), the second circumferential reinforcing plate (52), the radial inner wall (10) and the sealing plate (40) form a cooling channel (4) extending circumferentially and radially opposite to the stator assembly (2); preferably, an inlet (130) is provided axially between the first circumferential reinforcing plate (51) and the second circumferential reinforcing plate (52).

8. The ring motor of claim 7, wherein, The at least one axial reinforcing plate includes: at least one first axial reinforcing plate (61) disposed between the first sidewall (11) and the first circumferential reinforcing plate (51) and extending axially; at least one second axial reinforcing plate (62) disposed between the second sidewall (12) and the second circumferential reinforcing plate (52) and extending axially; and / or at least one intermediate reinforcing plate (63) disposed between the first circumferential reinforcing plate (51) and the second circumferential reinforcing plate (52) and extending axially and located radially outside the sealing plate (40); Preferably, a plurality of intermediate reinforcing plates (63) are provided between the first circumferential reinforcing plate (51) and the second circumferential reinforcing plate (52) and extending axially and located radially outside the sealing plate (40). The plurality of intermediate reinforcing plates (63) are axially connected between the first circumferential reinforcing plate (51) and the second circumferential reinforcing plate (52) and located radially outside the sealing plate (40), and corresponding intervention ports (130) are provided between adjacent intermediate reinforcing plates (63) in the circumferential direction.

9. The ring motor according to claim 5, comprising a first shroud (71) arranged outside the first side wall (11) and a second shroud (72) arranged outside the second side wall (12) to cover the stator assembly (2) and the rotor assembly (3) of the ring motor; wherein, The gap space is formed by the outer shell (1), the stator assembly (2), the rotor assembly (3), the first protective cover (71), and the second protective cover (72).

10. The ring motor of claim 9, wherein, A fan (9) is provided on the radial outer wall (13) to blow cooling air into the inner cavity (14), and the radial inner wall (10) includes an exhaust hole (101) to communicate the inner cavity (14) with the gap space.

11. The ring motor of claim 10, wherein, The reinforcing plate has a connecting hole to connect the chambers separated by the reinforcing plate in the inner cavity (14).

12. The ring motor of claim 10, wherein, The radial inner periphery of the first shield (71) and the second shield (72) includes a first labyrinth seal structure that is non-airtightly fitted with a second labyrinth seal structure on the mounting portion (30) of the rotor assembly (3) to prevent contaminants from entering but allow air from the gap space to escape.

13. The toroidal electric machine of any of claims 1-12, wherein, The rotor assembly (3) includes: a plurality of rotor cores (36); a mounting portion (30) which is annular and has a plurality of mounting portion strip grooves (34) extending axially and spaced apart from each other in the circumferential direction on its radially outer surface; and a plurality of mounting ribs (35), each mounting rib (35) having a first rib portion accommodated in the mounting portion strip groove (34) and a second rib portion accommodated in the strip groove on the radially inner surface of the rotor core, wherein the mounting portion strip groove (34) and the strip groove both have limiting portions that restrict the radial movement of the mounting rib (35).

14. The ring motor of claim 13, wherein, During the assembly of the rotor assembly (3), the plurality of rotor cores (36) can be moved to their mounting positions on the rotor mounting portion (30) by means of the sliding of the corresponding mounting ribs (35) in the corresponding mounting slots (34).

15. The toroidal electric machine of any one of claims 1-14, wherein, Rotor assembly (3) includes: The mounting part (30) is composed of a first mounting part (31), a second mounting part (32) and an intermediate mounting part (33) connecting the first mounting part (31) and the second mounting part (32). The intermediate mounting part (33) extends perpendicularly to the first mounting part (31) and the second mounting part (32), such that the cross-section of the mounting part (30) is T-shaped.

16. The ring motor as described in any one of claims 1-15, further comprising a plurality of positioning devices (15), each positioning device (15) comprising: Positioning base (151); and Positioning wheel (152) supported on the positioning base (151); The positioning base (151) is mounted on the outer casing (1), thereby enabling the positioning device (15) to change between at least a working posture and a disassembly posture and / or a lifting posture. In the working posture, the positioning wheel (152) is positioned in the guide groove (38) on the rotor assembly (3). In the disassembly posture, the positioning device (15) is removed from the outer casing (1). In the lifting posture, the positioning wheel (152) is lifted from the guide groove (38).

17. The toroidal electric machine of any one of claims 1-16, wherein, The stator assembly (2) includes stator laminations (150), each stator lamination (150) including a yoke (151), stator teeth (152), and a toothed shoe (153). The yoke (151) and the stator teeth (152) are integrally formed. The toothed shoe (153) is detachable and has a connecting protrusion (162) and a shoe portion (163). The width of the shoe portion (163) is greater than the width of the stator teeth (152). The stator teeth (152) have a connecting groove (161) at the end away from the yoke (151). The connecting groove (161) and the connecting protrusion (162) are complementary in shape. The connecting protrusion (162) has a first positioning part (171), a second positioning part (172) and a straight transition part (173) in the radially inward direction. The first positioning part (171) protrudes in the circumferential direction, the second positioning part (172) is recessed in the circumferential direction, and the circumferential width of the straight transition part (173) gradually widens in the radially inward direction. The straight transition part (173) is connected to the boot part (163).

18. The toroidal electric machine of any one of claims 1-17, wherein, The stator assembly (22) includes a stator core (221) and a stator conductor (222). The stator core (221) includes a yoke (231), a yoke (232), and a toothed shoe (233). The toothed shoe (233) is detachable relative to the yoke (231) and the yoke (232). The stator conductor (222) is arranged in a stator slot (234) between the yoke (232). The end (251) of the stator conductor (222) in the axial direction protrudes from the stator slot (234), and the end (251) is bent outward in the radial direction. Preferably, the stator conductor is configured as a ring conductor surrounding a stator tooth; Preferably, the toothed shoe (233) is inserted into the magnetic yoke (232) in the axial direction, and the end (251) of the stator conductor (222) is bent outward in the radial direction to such an extent that the end (251) does not interfere with the toothed shoe (233).

19. The ring motor as claimed in any one of claims 1-18, further comprising a mounting structure (41) for the ring motor, said mounting structure (41) comprising: A first lateral support (421) and a second lateral support (422), wherein the first lateral support (421) and the second lateral support (422) are fixed to the outer periphery of the housing (1), and The fixed base assembly (300) includes: The first support fastener (310) can be fixedly connected to the first lateral support (421); The second support fastener (320) is capable of being fixedly connected to the second lateral support (422); and A transverse connector (370) is used to fix the first support fastener (310) and the second support fastener (320). Preferably, the first lateral support (421) and the second lateral support (422) each include: a first connecting plate (230) extending in the horizontal direction, a base plate (240) for mounting to a corresponding first support fixing member (310) or second support fixing member (320), and a plurality of vertical connecting plates (270, 280) arranged in the horizontal direction and fixed to the first connecting plate (230) and the base plate (240); Preferably, the first support fixing member (310) and the second support fixing member (320) are metal seats, and have a first side and a second side located opposite to each other in the horizontal direction, wherein the transverse connecting member (370) includes at least two connecting members, the connecting members having a first mounting portion (371) fixedly connected to the first support fixing member (310) and a second mounting portion (372) fixedly connected to the second support fixing member (320), and are fixed to the first support fixing member (310) and the second support fixing member (320) on the first side and the second side, respectively.

20. A mill comprising: The ring motor as described in any one of claims 1-19; The cylinder (8) is fixedly connected to the rotor assembly (3) as the driven component.

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